Fuel Tank Protection
WARNING: This page is about a different car, the 2008 Dodge Sprinter. However, it is still accessible from the selected car via links, so may be relevant.
The fuel rail pressure is lowered in order to protect the fuel tank from overheating. The fuel temperature sensor measures the temperature of the fuel being supplied from the tank, in the high pressure flange. If the fuel is too warm the fuel rail pressure is further reduced by the quantity control valve.